644054470 has 16 divisors (see below), whose sum is σ = 1178304048. Its totient is φ = 253398240.

The previous prime is 644054459. The next prime is 644054471. The reversal of 644054470 is 74450446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644054471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527304 + ... + 528523.

It is an arithmetic number, because the mean of its divisors is an integer number (73644003).

Almost surely, 2^644054470 is an apocalyptic number.

644054470 is a deficient number, since it is larger than the sum of its proper divisors (534249578).

644054470 is a wasteful number, since it uses less digits than its factorization.

644054470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055895.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 644054470 is about 25378.2282675525. The cubic root of 644054470 is about 863.5898571683.

The spelling of 644054470 in words is "six hundred forty-four million, fifty-four thousand, four hundred seventy".